Round window versus cochleostomy technique in cochlear implantation: histologic findings.

Details

Serval ID
serval:BIB_7BAFC17149FD
Type
Article: article from journal or magazin.
Collection
Publications
Title
Round window versus cochleostomy technique in cochlear implantation: histologic findings.
Journal
Otology and Neurotology
Author(s)
Richard C., Fayad J.N., Doherty J., Linthicum F.H.
ISSN
1537-4505 (Electronic)
ISSN-L
1531-7129
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
33
Number
7
Pages
1181-1187
Language
english
Abstract
HYPOTHESIS: Cochleostomy or round window enlargement techniques for cochlear implant electrode insertion result in more abnormal tissue formation in the basal cochlea and are more apt to produce endolymphatic hydrops than round window electrode insertion.
METHODS: Twelve temporal bones from implanted patients were examined under light microscopy and reconstructed with 3-dimensional reconstruction software to determine cochlear damage and volume of neo-ossification and fibrosis after electrode insertion. Amount of new tissue was compared between 3 groups of bones: insertion through the round window (RW), after enlarging the RW (RWE) and cochleostomy (Cochl). The probable role of the electrode was evaluated in each case with hydrops.
RESULTS: More initial damage occurred in the Cochl and RWE groups than in the RW group, and the difference was significant between RWE and RW in cochlear segment I (p < 0.026). The volume of new bone in Segment I differed significantly between groups (p < 0.012) and was greater in the RWE group than in either the Cochl or RW groups (post hoc p's < 0.035 and 0.019, respectively). Hydrops was seen in 5 cases, all in the Cochl and RWE groups. Blockage of the duct was because of new tissue formation in 4 of the 5 hydrops cases.
CONCLUSION: With the electrodes in this series, implantation through the RW minimized initial intracochlear trauma and subsequent new tissue formation, whereas the RW extension technique used at the time of these implantations produced the greatest damage. Future studies may clarify whether today's techniques and electrodes will produce these same patterns of damage.
Keywords
Aged, Aged, 80 and over, Cochlear Implantation/adverse effects, Cochlear Implantation/methods, Endolymphatic Hydrops/etiology, Female, Humans, Male, Middle Aged, Round Window, Ear/injuries, Round Window, Ear/surgery, Temporal Bone/pathology, Temporal Bone/surgery
Pubmed
Web of science
Create date
09/02/2016 12:48
Last modification date
20/08/2019 14:37
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